The Effects of Transverse Magnetic Field and Density Variations on the Particle Energy Spectra in a Reconnecting 3D Current Sheet

摘要: Electron and proton acceleration by a super-Dreicer electric field is further investigated in non-neutral reconnecting current sheet (RCS) with variable plasma density. The tangential Bz transverse magnetic components Bx are assumed to vary the distances x z from X nullpoint linearly exponentially, respectively; longitudinal component (a ‘guiding field’) accepted constant. Particles found gain bulk of their energy thin region close where RCS density increases exponentially index λ also α. For constant (λ = 0), variations lead particle power-law spectra spectral indices γ1 being dependent on exponent α as: \(\gamma_1 1 + \frac{1}{2\alpha}\) for protons 1+ \frac{1}{\alpha}\) electrons strong guiding (β > 10−2) =\frac {1} 2 (1 +\frac{1}{\alpha})\) moderate or weak 10−4). an exponential increase vicinity (λ≥ 0) there resulting γ that depends as \(\gamma \gamma_1 +\frac{\lambda}{2\alpha}\) weaker fields \frac{\lambda}{\alpha}\) stronger fields. These dependencies can explain wide variety (1.5–10) observed solar flares topology physical conditions region. This be used diagnostic tool investigation dynamics accelerated hard X-ray microwave emission.